Theres a lot of confusion around peptides and muscle., Heres how I actually think about it., Most peptides dont build muscle directly., They improve the systems that allow muscle to grow., First, The Benefits of Peptides for Muscle Growth and Fat Loss IGF 1 LR3 Injection Benefits And How It Works The HCG Institute IGF 1 Facilitates Cartilage Reconstruction by Regulating PI3K AKT, MAP JIR Dove Medical Press